‰ NOW 40 WPM ‰ TEXT IS FROM DECEMBER 2008 QST PAGES 38, 39 AND 75 ‰
METER BEAM TUNING AFTER THE LOOP WAS ADDED. PULLING IT ALL TOGETHER THE TV
ANTENNA HAD A 5 FOOT LONG MAST THAT WAS PLACED IN A LIGHTWEIGHT TV ROTATOR
MOUNTED ON A 10 FOOT PIPE ON THE SIDE OF THE HOUSE. IT IS ONLY ABOUT 20
FEET AWAY FROM THE CREATE 40 METER VERTI
‰ FROM PAGE 75 ‰
Stonewall Jackson ARA K8DF K8TPH 348 2 20 1,810 WV Bellbrook ARC W8DGN 474
COMBINATION. USING THE LOG PERIODIC DESIGN PROGRAM FROM THE 19TH EDITION
OF THE ARRL ANTENNA BOOK, THE TV ANTENNA BOOM LENGTH AND NUMBER OF ELEMENTS
WERE INPUT AS A START ING POINT. THE PROGRAM FOUND THE ELEMENT LENGTHS
NEEDED FOR A 144 TO 148 MHZ LOG PERIODIC WITH AN 111 INCH LONG BOOM. THE
ELEMENTS WERE TRIMMED TO LENGTH SEE TABLE 1 WITH AN EXTRA INCH ON EACH SIDE
FOR MARGIN. I USED AN MFJ 259B ANTENNA ANALYZER TO PLOT THE IMPEDANCE OF
THE ANTENNA. I COMPARED THE MEASUREMENTS TO THE PROGRAM RESULTS AND FOUND
IT WAS RIGHT ON, SO I TRIMMED OFF THE EXTRA INCHES. THE DESIGN PROGRAM
INDICATED A SPACING FOR THE TARGET 2 METER ANTENNA OF ABOUT 15R7 INCHES
BETWEEN THE TWO REAR ELEMENTS AND 12R2 INCHES BETWEEN THE TWO FRONT
ELEMENTS. MOVING THE TV ANTENNA ELEMENTS WOULD BE TIME CONSUMING SO I LEFT
THE SPACING AS IT WAS. THE TV ANTENNA GENERALLY HAS APPROXIMATELY 12R5
INCHES BETWEEN ELEMENTS 1 THROUGH 5, 17 INCHES BETWEEN ELEMENTS 5 AND 6, 17
INCHES BETWEEN ELEMENTS 6 AND 7 AND 12R5 INCHES BETWEEN ELEMENTS 7 THROUGH
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1,880 IL W4NPS 422 2 8 1,876 VA Estes Valley ARC W0RP KC0KNU 332 2 41 1,872
CO WA4USN WA4GPS 201 2 70 1,864 SC Big Rapids Area ARC N8OE 331 2 18 1,846
A LOW NOISE LOOP THAT WORKS PLUS A BONUS 2 METER BEAM GET AN HF BAND
RECEIVE ANTENNA AND A VHF LOG PERIODIC, ALL ON ONE BOOM. RICK DARWICKI,
N6PE A AFTER SUBSCRIBING TO OUR LOCAL TV CHANNELS VIA DIRECT BROADCAST
SATELLITE, I NO LONGER HAD ANY USE FOR MY OLD TV ANTENNA. I DECIDED THAT
RATHER THAN DISCARD IT, IN TYPICAL AMATEUR RADIO FASHION, I WOULD MAKE IT
INTO A HAM ANTENNA PROJECT. I WAS MORE SUCCESSFUL THAN I HAD HOPED. THIS
IS NOT MEANT TO BE A TYPICAL CONSTRUC TION ARTICLE. THE ANTENNA DESCRIBED
IS BASICALLY A 2 METER BEAM MADE FROM AN OLD TV ANTENNA AND A ROTATABLE
RECEIVING LOOP THAT IS SIMILAR TO ONE HALF OF A K9AY ARRAY SEE FIGURE 1
MOUNTED ABOVE GROUND. IT PERFORMS WELL ON 2 METER FM AND IS VERY EFFECTIVE
AS A LOW NOISE RECEIVING ANTENNA. THE COST IS NEXT TO NOTHING AND THE
WHOLE THING HAS A FAIRLY LOW PROFILE. START WITH WHATS AT HAND MY TV
ANTENNA WAS A LARGE RADIOSHACK UNIT WITH VHF/UHF ELEMENTS WITH A SECOND
SUPPORT BOOM BELOW THE MAIN BOOM. THERE WERE NINE ELEMENTS BENT INWARD IN
TYPICAL TV ANTENNA FASHION. OTHER TV ANTENNAS COULD BE MODIFIED AND
DIFFERENT MECHANICAL ARRANGE MENTS COULD BE DEVISED TO CREATE A SIMILAR
‰ FROM PAGE 75 ‰
San Angelo ARC W5QX KD5SBE 297 2 39 1,908 WTX West Central Ohio ARA WC8OH
552 2 22 1,902 OH Sportsmans Paradise ARC K4WAK 402 2 14 1,892 NFL Madison
Oneida ARC W2MO 452 2 23 1,888 WNY Northwest Illinois ARC W9F N9WN 342 2 12
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